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Anti-blocking performance of ultrahigh-pressure waterjet assisted furrow opener for no-till seeder

International Journal of Agricultural and Biological Engineering 2020年第2期13卷 64-70,F0002页

作者： hongnan hu Hongwen Li Qingjie Wang Jin He Caiyun Lu Yingbo Wang Peng Liu College of Engineering China Agricultural UniversityBeijing 100083China China Agricultural University National Institute for Conservation Tillage Beijing 100083China Scientific Observing and Experimental Station of Arable Land Conservation(North Hebei) Ministry of Agriculture and Rural AffairsBeijing 100083China

No-till planting method is widely used for maize-wheat two-crops-a-year area in the North China ***,cruel soil conditions,especially the large number of maize stalks which are hard to cutoff covering,often cause an unsatisfying planting *** on the authors’previous investigation,ultrahigh-pressure(UHP)waterjet is capable to solve this problem and obtain qualified ***,a UHP waterjet assisted furrow opener for no-till seeder was *** tests showed that double-disc furrow openers worked well with UHP waterjet,since the sharpened disc blades could help to cut soil and residue,meanwhile,minimize soil *** surface method(RSM)was used to investigate the relationship among forward speed,waterjet pressure,jet impingement angle and anti-blocking performance(stalks cutoff ratio and depth of soil cutting),and a Box-Behnken three-factor design was used to identify the optional operation parameters.A total of 17 combinations were conducted,and the results showed all three operation parameters significantly affected anti-blocking *** cutoff ratio and depth of soil cutting increased with the increase of waterjet pressure,jet impingement angle,and decreased with the increase of forward *** optimization analysis indicated that when waterjet pressure was 267-280 MPa,jet impingement angle was 80.2°to 90.0°and forward speed was 4.00-4.42 km/h,the overall performance of UHP waterjet assisted double-disc furrow opener for no-till seeder was *** cutoff ratio could be above 95%and no blockage *** study may provide a new approach and reference for the anti-blocking technology of no-tillage seeding.

关键词： waterjet ultrahigh-pressure conservation tillage maize stalks cutting no-till anti-blocking

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Performance of waterjet on cutting maize stalks: A preliminary investigation

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International Journal of Agricultural and Biological Engineering 2019年第5期12卷 64-70页

作者： hongnan hu Hongwen Li Qingjie Wang Jin He Caiyun Lu Yingbo Wang Chunlei Wang College of Engineering China Agricultural UniversityBeijing 100083China

Large amounts of crop stalks left in the field as a result of conservation agriculture cause blockage during no-till *** solve this issue,pure waterjet was used to cut off the maize stalks so that the rear furrow opener could pass through without *** this investigation,an experimental study on depth of cut,which was the main performance indicator of pure waterjet on cutting maize stalks,was presented.A full factorial design with 200 tests was implemented with respect to three operation parameters,that is traverse speed,waterjet pressure,and standoff distance were considered as *** analysis of variance(ANOVA)was carried out in order to determine the statistical significance of individual operation *** multilinear stepwise regression analysis,a model to predict the cut of depth from the predicted pure waterjet operation to cut maize stalks was then *** three operation parameters significantly influenced the cutting ***,the results indicated that depth of cut increased with the increase of waterjet pressure,the decrease of traverse speed,and decrease in standoff *** pressure provided major contribution to depth of cut,followed by traverse speed,then standoff distance,which was demonstrated by both ANOVA and regression *** experimental results showed that when the standoff distance was closer than 10 mm and waterjet pressure was 280 MPa,all maize stalks specimen could be cutoff *** the consideration of field operating conditions,waterjet pressure of 280 MPa or higher and 10 mm to 15 mm standoff distance were recommended for maize stalks *** analysis provided a realistic approach for the optimization of the ultra-high pressure pure waterjet parameters in maize stalks cutting,which could be used to relieve the occurrence of straw blockage in no-till planting.

关键词： waterjet ultra-high pressure conservation tillage maize stalks cutting traverse speed standoff distance

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Design and experiment of anti-vibrating and anti-wrapping rotary components for subsoiler cum rotary tiller

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International Journal of Agricultural and Biological Engineering 2019年第4期12卷 47-55页

作者： Kan Zheng Allen D.Mchugh Hongwen Li Qingjie Wang Caiyun Lu hongnan hu Wenzheng Liu Zhiqiang Zhang Peng Liu Jin He College of Engineering China Agricultural UniversityBeijing 100083China International Maize and Wheat Improvement Centre(CIMMYT) Dhaka 1213Bangladesh

The commonly used subsoiling cum rotary tiller machine(SRT)in Northern China is a combination of subsoiler and horizontal rotary tiller,however backfilling of the subsoiling slot,excessive vibration and plant residue wrapping on rotary components has been rarely ***,the rotary components and assembly were redesigned to address these issues and to an SRT fitted with IT225 short curve rotary blades behind the V-shape subsoiling slots and IIT245 long curve rotary blades between the *** and short blades were fitted on a rotor in a double helix,with optimal spiral angles of 65° and 90°,and phase angle of 147°and 180°,*** with the commonly used SRT(CSRT),the additional anti-wrapping cutting blades in the circumferential and axial direction of ASRT could remove hanging residue on the blade holders,wrapping on the rotor and formation of an isolation ***,the cutting edge curve of anti-wrapping cutting blades was an exponential *** tests demonstrated that the redesigned SRT with anti-vibrating and anti-wrapping rotary components(ASRT)had was a significant advancement over the ***,the working depth of rotary tillage was more stable,while other observations confirmed that backfilling of the subsoiling slot was also improved.

关键词： subsoiling rotary tiller anti-vibration anti-wrapping backfill tillage

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小学篮球球性球感训练对教学效果的实验研究

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体育科技文献通报 2015年第5期23卷 90-91页

作者：胡宏南苏州相城实验小学江苏苏州215000

通过文献资料法、专家访谈法、调查分析法等,对小学生进行球性球感的训练,最后通过专家考核得出结论:球性球感的练习可以提高学生控制和支配球的能力,激发学生积极参与到运动中来,经过练习的学生整体考核均分也高于常态课的学生。

关键词：小学篮球球性球感

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小学体育课中篮球内容教学的问题及改进方法

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体育科技文献通报 2015年第11期23卷 67-68页

作者：胡宏南苏州相城实验小学江苏苏州215000

小学生处于身心发展的关键期,活动好动却又不能集中注意力是他们的天性,篮球运动是发展学生全面素质非常好的项目。对如何在小学体育与健康课堂开展篮球教学,提出了优化师资、硬件,利用游戏教学等多种方法。

关键词：小学体育篮球

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反旋深松联合作业耕整机设计与试验

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农业机械学报 2017年第8期48卷 61-71页

作者：郑侃何进李洪文赵宏波胡宏男刘文政中国农业大学工学院北京100083

针对现有深松旋耕联合作业机多为深松部件在前、旋耕部件在后的组合结构,较少考虑各工作部件作业时之间的相互影响,本文基于深松部件、旋耕部件作业之间的交互作用,设计一种用于深耕的反旋深松联合作业耕整机,通过旋耕、深松、镇压多工... 详细信息

针对现有深松旋耕联合作业机多为深松部件在前、旋耕部件在后的组合结构,较少考虑各工作部件作业时之间的相互影响,本文基于深松部件、旋耕部件作业之间的交互作用,设计一种用于深耕的反旋深松联合作业耕整机,通过旋耕、深松、镇压多工序实现表层土壤细碎、秸秆埋覆,深层土壤疏松目的。整机以提高作业质量、减少作业阻力为设计目标,运用离散元仿真与正交试验、有限元仿真结合进行整机参数优化。离散元仿真结果表明:机具作业速度v_m为1.8 km/h、刀轴转速n为350 r/min、旋耕刀类型X为IIT195弯刀时,机具作业壅土量为5 283个土壤颗粒,植被覆盖率为98.37%,此时综合作业质量较优;有限元仿真结果验证了深松铲设计强度满足作业要求。以较优参数组合为基础的田间试验结果表明:反旋深松联合作业耕整机旋耕深度、深松深度、地表平整度、土壤膨松度分别为182.8 mm、388.4 mm、18.3 mm、17.22%;旋耕深度稳定性、深松深度稳定性、植被覆盖率均在90%以上,完全满足深层土壤整地需求;与深松旋耕联合整地机相比,反旋深松联合作业耕整机在不影响作业效果前提下,提高了耕深稳定性、植被覆盖率,同时使牵引阻力降低了16.21%,作业稳定性、可靠性较好。

关键词：深松旋耕联合作业离散元法

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作业次序对深松旋耕联合作业机作业质量及功耗的影响

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农业工程学报 2017年第21期33卷 52-60页

作者：郑侃何进李洪文陈黎卿胡宏男刘文政中国农业大学工学院北京100083 安徽农业大学工学院合肥230036

该文选用华北平原壤土区常用的深松旋耕联合作业机作为试验设备,分析深松、旋耕作业次序对其作业质量及功耗的影响。运用离散元仿真分析结果表明,旋耕深松作业次序比深松旋耕作业次序的工作紧凑、刀辊受力均匀。随着作业深度的增加,深... 详细信息

该文选用华北平原壤土区常用的深松旋耕联合作业机作为试验设备,分析深松、旋耕作业次序对其作业质量及功耗的影响。运用离散元仿真分析结果表明,旋耕深松作业次序比深松旋耕作业次序的工作紧凑、刀辊受力均匀。随着作业深度的增加,深松旋耕作业次序作用的深层土壤较多。建立以旋耕深度、深松深度为因素,以2种作业次序功耗为指标的回归方程综合分析得出,作业深度较浅时,深松旋耕作业次序功耗、地表平整度、植被覆盖率优于旋耕深松作业次序;作业深度较大时,旋耕深松作业次序功耗明显小于深松旋耕作业次序,且两者作业质量差异不显著。田间试验表明,离散元仿真建立的2种作业次序作业深度与作业功耗的回归方程及测量的地表平整度、土壤膨松度及植被埋覆率基本能真实反映田间作业情况。

关键词：机械化计算机仿真模型深松旋耕联合作业离散元法

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基于离散元法的砖红壤斜柄折翼式深松铲设计与试验

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农业机械学报 2022年第3期53卷 40-49页

作者：张喜瑞曾望强刘俊孝吴鹏董学虎胡宏男海南大学机电工程学院海口570228 曼尼托巴大学生物系统工程系温尼伯R3T2N2 海南省农业机械鉴定推广站海口570206 仲恺农业工程学院机电工程学院广州510225

针对深松整地装备应用于海南省热带农业区香蕉地时,存在作业阻力大、松土面积小及地表平整度差等问题,本文基于海南香蕉地砖红壤土的物理特性,设计一种可有效降低作业阻力的斜柄折翼式深松铲。运用离散元法建立3层土壤颗粒虚拟仿真土槽... 详细信息

针对深松整地装备应用于海南省热带农业区香蕉地时,存在作业阻力大、松土面积小及地表平整度差等问题,本文基于海南香蕉地砖红壤土的物理特性,设计一种可有效降低作业阻力的斜柄折翼式深松铲。运用离散元法建立3层土壤颗粒虚拟仿真土槽模型,使用Hertz-Mindlin with JKR接触模型进行了斜柄折翼式深松铲与直柄凿式深松铲的作业性能对比仿真。结果表明,在确保深松效率的前提下,进行了深松铲最佳作业速度仿真试验,得出斜柄折翼式深松铲的最佳作业速度区间为3.24~3.96 km/h;相较于直柄凿式深松铲,斜柄折翼式深松铲工作阻力降低了16.2%,地表平整度提高了25.9%,深松后沟槽宽度减小了36.3%;田间试验结果表明,斜柄折翼式深松铲和直柄凿式深松铲在耕作阻力、地表平整度、深松沟槽宽度实测值与仿真值之间的误差不超过2%,仿真结果可靠性高。仿真分析与田间试验表明,相较于直柄凿式深松铲,斜柄折翼式深松铲在作业过程中对地表轮廓破坏较小,能有效降低对土层的扰动并增大松土面积,作业后地表平整度高、沟槽宽度小,从而能够更好地适应热带农业区香蕉地的作业环境。

关键词：香蕉地砖红壤土深松铲斜柄折翼式离散元法

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Photo‑Energized MoS_(2)/CNT Cathode for High‑Performance Li–CO_(2)Batteries in a Wide‑Temperature Range

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Nano-Micro Letters 2025年第1期17卷 160-175页

作者： Tingsong hu Wenyi Lian Kang hu Qiuju Li Xueliang Cui Tengyu Yao Laifa Shen Jiangsu Key Laboratory of Materials and Technologies for Energy Storage College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

Li–CO_(2) batteries are considered promising energy storage systems in extreme environments such as Mars;however,severe performance degradation will occur at a subzero temperature owning to the sluggish reaction ***,a photo-energized strategy adopting sustainable solar energy in wide working temperature range Li–CO_(2) battery was achieved with a binder-free MoS_(2)/carbon nanotube(CNT)photo-electrode as *** unique layered structure and excellent photoelectric properties of MoS_(2) facilitate the abundant generation and rapid transfer of photo-excited carriers,which accelerate the CO_(2) reduction and Li_(2)CO_(3) decomposition upon *** illuminated battery at room temperature exhibited high discharge voltage of 2.95 V and mitigated charge voltage of 3.27 V,attaining superior energy efficiency of 90.2%and excellent cycling stability of over 120 *** at an extremely low temperature of−30℃,the battery with same electrolyte can still deliver a small polarization of 0.45 V by the photoelectric and photothermal synergistic mechanism of MoS_(2)/CNT *** work demonstrates the promising potential of the photo-energized wide working temperature range Li–CO_(2) battery in addressing the obstacle of charge overpotential and energy efficiency.

关键词： Li-CO_(2)batteries Photo-energized Wide operation-temperature Kinetics MoS_(2)

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Fabrication and Mechano-sensing Characteristics of Bending Polypyrrole Actuator

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 240-245页

作者： CHEN Jinyou hu Wei School of Automotive Engineering Hunan Financial&Industrial Vocational-technical CollegeHengyang 421002China College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China

To prepare a conductive polymer actuator with decent performance,a self-built experimental platform for the preparation of polypyrrole film is *** of the essential goals is to examine the mechanical characteristics of the actuator in the presence of various combinations of process parameters,combined with the orthogonal test method of"four factors and three levels".The bending and sensing characteristics of actuators of various sizes are methodically examined using a self-made bending polypyrrole *** functional relationship between the bending displacement and the output voltage signal is established by studying the characteristics of the actuator sensor subjected to various degrees of *** experimental results reveal that the bending displacement of the actuator tip almost exhibits a linear variation as a function of length and *** the voltage reaches 0.8 V,the bending speed of the actuator tends to be ***,the mechanical properties of the self-assembled polypyrrole actuator are verified by the design and fabrication of the microgripper.

关键词： conductive polymer polypyrrole mechanical characteristics actuators sensing characteristics

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